Reload with articulation stabilization system

ABSTRACT

A surgical reload includes a proximal body portion defining a first longitudinal axis, a tool assembly defining a second longitudinal axis, and an articulation stabilization system. The tool assembly is pivotably supported on a distal end of the proximal body portion between a non-articulated position in which the first and second longitudinal axes are coaxial and articulated positions in which the first and second axes define an acute angle. The articulation stabilization system is configured to urge the tool assembly in relation to the proximal body portion to the non-articulated position.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of and priority to U.S. Provisional Patent Application Ser. No. 62/585,703, filed Nov. 14, 2017, the entire disclosure of which is incorporated by reference herein.

BACKGROUND 1. Technical Description

The present disclosure is directed to a reload for a linear endoscopic stapler and, more particularly, to a reload for a linear endoscopic stapler that includes a tool assembly that articulates.

2. Background of Related Art

Endoscopic staplers that have a tool assembly that is mounted for articulation are well known. In such devices even small side loads on the tool assembly during storage of shipping causes the tool assembly to articulate slightly off a center position. This slight articulation can result in permanent deformation of a flexible drive member that is supported within the tool assembly. Maintaining the tool assembly in the straight, non-articulated position can be important for secure tissue manipulation, as well as ease of insertion and removal of the stapler tool assembly through an endoscopic access port.

A continuing need exists in the stapling arts for a surgical stapler having a tool assembly capable of articulation that can maintain a non-articulated position in response to small loads applied to the tool assembly during periods of non-use such as during storage and shipping.

SUMMARY

One aspect of the disclosure is directed to a reload including a proximal body and a tool assembly. The proximal body portion defines a longitudinal axis and includes a housing. A drive member is movably supported within the housing between a retracted position and an advanced position. The housing also supports a first articulation link and a second articulation link. The tool assembly defines a longitudinal axis and is pivotably supported on a distal end of the proximal body portion. The tool assembly includes a first jaw and a second jaw. The first jaw is pivotable in relation to the second jaw between a spaced position and a clamped position. A mounting assembly is secured to a proximal portion of the tool assembly and includes a pivot member defining a pivot axis “X”. The first articulation link is connected to the mounting assembly on one side of the pivot axis “X” and the second articulation link is connected to the mounting assembly on an opposite side of the pivot axis “X”. The first and second articulation links are axially movable within the housing to pivot the tool assembly about the pivot axis “X” from a non-articulated position to a plurality of articulated positions. A stabilization system includes a slide member and a biasing member. The slide member is slidably positioned on the housing of the proximal body portion and is engaged with the first and second articulation links. The biasing member is positioned to urge the slide member in a direction to urge the tool assembly towards the non-articulated position.

Another aspect of the disclosure is directed to a surgical stapling device including a handle assembly, an elongated body portion, and a tool assembly. The elongated body portion defines a longitudinal axis and includes a housing, a drive member movably supported within the housing between retracted and advanced positions, a first articulation link and, a second articulation link. The tool assembly defines a longitudinal axis and is pivotably supported on a distal end of the elongated body portion. The tool assembly includes a first jaw and a second jaw. The first jaw is pivotable in relation to the second jaw between a spaced position and a clamped position. A mounting assembly is secured to a proximal portion of the tool assembly and includes a pivot member that defines a pivot axis “X”. The first articulation link is connected to the mounting assembly on one side of the pivot axis “X” and the second articulation link is connected to the mounting assembly on an opposite side of the pivot axis “X”. A stabilization system includes a slide member and a biasing member. The slide member is slidably positioned on the housing of the proximal body portion and is engaged with the first and second articulation links. The biasing member is positioned to urge the slide member in a direction to urge the tool assembly towards the non-articulated position.

In embodiments, the slide member includes first and second halves that are slidably positioned about the housing of the proximal body portion.

In some embodiments, the housing defines an annular recess and the slide member is slidably positioned within the annular recess.

In certain embodiments, the biasing member includes at least one coil spring.

In embodiments, the slide member includes at least one mounting tab and each of the at least one coil springs has a first end positioned about a respective one of the at least one mounting tabs.

In some embodiments, the slide member includes first and second halves and each of the first and second halves of the slide member has two mounting tabs, each of the mounting tabs being engaged with one of the plurality of coil springs.

In certain embodiments, the housing of the proximal body portion defines at least one pocket and each of the at least one coil springs is received within one of the at least one pocket.

In embodiments, the slide member includes first and second link tabs and each of the first and second link tabs is engaged with one of the first and second articulation links.

In some embodiments, each of the first and second articulation links defines a notch and each of the first and second link tabs is engaged with the notch of a respective one of the first and second articulation links.

In certain embodiments, the first articulation link includes a proximal end configured to engage an articulation mechanism of a surgical stapling device.

BRIEF DESCRIPTION OF THE DRAWINGS

Various embodiments of the presently disclosed reload with stabilization system are described herein below with reference to the drawings, wherein:

FIG. 1 is a side perspective view of an electrically powered surgical stapler including one exemplary embodiment of the presently disclosed reload with a tool assembly in the open position;

FIG. 2 is a side perspective view of a manually powered surgical stapler including the reload shown in FIG. 1 with the tool assembly in the clamped position;

FIG. 3 is a side perspective view of the reload shown in FIG. 2 in a non-articulated position with the tool assembly in the open position;

FIG. 4 is a side perspective view of the reload shown in FIG. 3 in an articulated position with the tool assembly in the clamped position;

FIG. 5 is a side perspective exploded view of the reload shown in FIG. 4;

FIG. 6 is a side perspective exploded view of an articulation stabilization system of the reload shown in FIG. 3;

FIG. 7 is an enlarged view of the indicated area of detail shown in FIG. 6;

FIG. 8 is a top view of the reload shown in FIG. 3 with an outer housing removed in a non-articulated position with the tool assembly in the clamped position;

FIG. 9 is an enlarged view of the indicated area of detail shown in FIG. 8;

FIG. 10 is a top perspective view of a proximal portion of the reload shown in FIG. 3 in a non-articulated position with the outer housing, a upper housing half, a drive member, and biasing members removed;

FIG. 11 is a cross-sectional view taken along section line 11-11 of FIG. 10;

FIG. 12 is an enlarged view of the indicated area of detail shown in FIG. 11;

FIG. 13 is a top perspective view of the proximal portion of the reload shown in FIG. 3 with an outer housing removed in a first articulated position;

FIG. 14 is a top perspective view of the proximal portion of the reload shown in FIG. 3 in an articulated position with the outer housing, a upper housing half, a drive member, and biasing members removed;

FIG. 15 is a cross-sectional view taken along section line 15-15 of FIG. 13;

FIG. 16 is an enlarged view of the indicated area of detail shown in FIG. 15;

FIG. 17 is a cross-sectional view taken along section line 15-15 of FIG. 13 in a second articulated position; and

FIG. 18 is an enlarged view of the indicated area of detail shown in FIG. 17.

DETAILED DESCRIPTION OF EMBODIMENTS

The presently disclosed reload with articulation stabilization system will now be described in detail with reference to the drawings in which like reference numerals designate identical or corresponding elements in each of the several views. However, it is to be understood that the disclosed embodiments are merely exemplary of the disclosure and may be embodied in various forms. Well-known functions or constructions are not described in detail to avoid obscuring the present disclosure in unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.

In this description, the term “proximal” is used generally to refer to that portion of the device that is closer to a clinician, while the term “distal” is used generally to refer to that portion of the device that is farther from the clinician. In addition, the term “endoscopic” is generally used to refer to endoscopic, laparoscopic, arthroscopic, and/or any other procedure conducted through small diameter incision or cannula. Further, the term “clinician” is used generally to refer to medical personnel including doctors, surgeons, nurses, and support personnel.

The presently disclosed reload includes a proximal body portion defining a first longitudinal axis, a tool assembly defining a second longitudinal axis, and an articulation stabilization system. The tool assembly is pivotably supported on a distal end of the proximal body portion between a non-articulated position in which the first and second longitudinal axes are coaxial and articulated positions in which the first and second axes define a plurality of acute angles. The articulation stabilization system is configured to urge the tool assembly in relation to the proximal body portion to the non-articulated position.

Referring to FIG. 1, the presently disclosed reload shown generally as 10 is supported on a distal end of a surgical stapling device 100. In embodiments, the surgical stapling device 100 includes the reload 10, a powered handle assembly 110, and an adapter 112 that extends distally from the powered handle assembly 110. The reload 10 may be in the form of a disposable loading unit that is releasably coupled to the distal end of the adapter 112 using, for example, a bayonet-type coupling. Alternately, it is envisioned that the reload 10, the adapter 112, and/or the powered handle 110 may be integrally or non-removably secured to each other. U.S. Pat. No. 9,055,943 (“the '943 Patent”) discloses a surgical stapling device having a powered handle, an adapter, and a tool assembly that is releasably coupled to the adapter. The '943 Patent is incorporated herein by reference in its entirety.

Referring to FIG. 2, in some embodiments, the surgical stapling device 200 includes the reload 10, a manually actuated handle assembly 210, and an elongated body portion 212 that extends from the handle assembly 210. As discussed above with regard to the stapling device 100 (FIG. 1), the reload 10 may be in the form of a disposable loading unit that is releasably coupled to the distal end of the elongated body portion 212 using, for example, a bayonet-type coupling. Alternately, it is envisioned that the reload 10 and the elongated body portion 212 may be integrally or non-removably secured to each other. U.S. Pat. No. 5,865,361 (“the '361 Patent”) discloses a surgical stapling device having a manually actuated handle, an elongated body portion, and a tool assembly that is releasably coupled to the elongated body portion. The '361 Patent is incorporated herein by reference in its entirety.

Referring to FIGS. 3 and 4, the reload 10 includes a proximal body portion 12 and a tool assembly 14. The tool assembly 14 is pivotably coupled to a distal end of the proximal body portion 12 about a pivot axis “X” and includes an anvil 16 and a cartridge assembly 18. The cartridge assembly 18 is pivotably coupled to the anvil 16 about a pivot axis “Y” between an open position (FIG. 3) and a clamped position (FIG. 4). Alternatively, it is envisioned that the cartridge assembly 18 can be stationary and the anvil 16 can be movable between the open and clamped positions such as described in the '361 Patent. The anvil 16 includes a proximally extending bracket 40 that defines an opening (not shown).

Referring to FIG. 5, the proximal body portion 12 of the reload 10 (FIG. 3) includes an outer casing 20, a first housing half-section 22 a, a second housing half-section 22 b, a mounting assembly 26, articulation links 28 and 30, a drive member 32, and an articulation stabilization mechanism 34. The drive member 32 of the reload 10 includes a working end 32 a that is movable through the tool assembly 14 to actuate the tool assembly 14 as is known in the art. For a more detailed description of the drive assembly see the '361 Patent. The first and second housing half-sections 22 a, 22 b are secured together to define a housing 22 that supports the articulation links 28, 30 and the stabilization mechanism 34 as described in further detail below.

The mounting assembly 26 includes an upper mounting portion 35 and a lower mounting portion 36. The upper mounting portion 35 includes a pivot member 38. A first coupling member 44 has a first end that defines an opening 44 a that receives the pivot member 38 on the upper mounting portion 35 and a second end which is received within a recess 46 defined in a distal end of the first housing half-section 22 a of the reload 10 such that the coupling member 44 pivotably secures the tool assembly 14 to the first housing half-section 22 a.

The lower mounting portion 36 also includes a pivot member (not shown). The pivot member of the lower mounting portion 36 is received within the opening of the bracket 40 (FIG. 3) formed on the proximal end of the anvil 16 to secure the lower mounting portion 36 to the anvil 16. A second coupling member 48 has a first end defining an opening 48 a that receives the pivot member of the lower mounting portion 36 and a second end that is received within a recess 50 defined within the lower housing half-section 22 b to pivotally secure the lower mounting portion 36 to the lower housing half-section 22 b of the body portion 12 of the reload 10. The outer casing 20 of the proximal portion 12 of the reload 10 is positioned about the first and second housing half-sections 22 a, 22 b to prevent separation of the first and second housing half-sections 22 a, 22 b from one another and to prevent the second ends of the first and second coupling members 44 and 48 from moving from within the recesses 46, 48.

The lower mounting portion 36 includes a pair of distal extensions 52 that are spaced from one another to define a slot 54. The distal extensions 50 are received in a proximal end of the anvil 16 (FIG. 3) and define openings 52 a. The proximal end of the anvil 16 and the proximal end of the cartridge assembly 18 also define openings 54 (FIG. 4) that are aligned with the openings 52 a in the anvil 16 and cartridge assembly 18. The openings 52 a receive pivot members 56 to secure the anvil 16 to the lower mounting portion 36 and to pivotably secure the cartridge assembly 18 to the anvil 16.

Referring to FIGS. 3-5, the upper mounting portion 35 includes spaced openings 60 (FIG. 5) and the lower mounting portion includes spaced openings 62 (FIG. 5). The spaced openings 60 and 62 are offset from the pivot axis “X” (FIG. 4) of the tool assembly 14 and are dimensioned to receive pins or rivets 66 (FIG. 5) to secure the mounting portions 35, 36 to one another. The pins 66 also secure a distal end of the articulation links 28 and 30 to the mounting assembly 26 as described in further detail below.

The articulation link 28 is slidably supported within the housing 22 and includes a distal end that defines an opening 70 and a proximal end that is configured to engage an articulation mechanism of a surgical stapling device 100 (FIG. 1) or 200 (FIG. 2). A central portion of the articulation link 28 defines a notch 72 that is accessible through a slot 73 (FIG. 5) defined in the housing half-section 22 b. In embodiments, the proximal end of the articulation link 28 includes a transverse extension or hook 74 that is configured to releasably engage an articulation mechanism of a surgical stapling device 100 or 200. See, e.g., the '361 Patent. The opening 70 receives one of the pins 66 (FIG. 5) to pivotably secure the distal end of the articulation link 28 to the mounting assembly 26. As discussed above, the openings 60 are offset laterally from the pivot axis “X” such that the distal end of the articulation link 28 is secured to the mounting assembly 26 at a location spaced from the pivot axis “X”. As such, when the articulation link 28 is moved within the housing 22 axially, the tool assembly 14 is pivoted about the pivot axis “X” (FIG. 4.)

The articulation link 30 is slidably supported within the housing 22 and includes a distal end that defines an opening 76 and a proximal end that defines a notch 78. The notch 78 is accessible through a recess 79 (FIG. 5) formed in the housing half-section 22 a.

Referring to FIGS. 5-12, the articulation stabilization system 34 includes a first biasing mechanism 82 and a second biasing mechanism 84. Alternately, a single or integral biasing mechanism may be provided. The first biasing mechanism 82 includes a slide member half-section 90 and springs 92. In embodiments, the slide member half-section 90 is annular and is slidably positioned within a recess 94 defined in an outer surface of the housing half-sections 22 a, 22 b. In some embodiments, the slide member half-section 90 has a substantially C-shaped body having distally extending spring mounting tabs 98, a distally extending link tab 111, side wall recesses 112, and side wall extensions 114.

In embodiments, the springs 92 are coil springs that have a proximal portion that is received about the spring mounting tabs 98 of the slide member half-section 90. Each of the springs 92 is positioned within a respective a pocket 116 (FIG. 9) defined in the housing 22 to urge the annular slide member 90 distally along the housing 22. The link tab 111 is positioned to be received within the notch 72 and engage the articulation link 28 to urge the articulation link 28 to a position in which the tool assembly 14 is in a non-articulated position. When the articulation link 28 is positioned such that the tool assembly 14 is in the non-articulated position, with the longitudinal axis of the tool assembly 14 of the reload 10 aligned with the longitudinal axis of the proximal body portion 12 of the reload 10, the springs 92 are in an unbiased state and the link tab 111 received within the notch 72 of the articulation link 28.

The second biasing mechanism 84 is substantially similar to the first biasing mechanism 82 and includes a slide member half-section 120 and springs 122. As discussed above, in embodiments, the slide member half-section 120 is annular and is slidably positioned within a recess 94 defined in an outer surface of the housing 22. In some embodiments, the slide member half-section 120 has a substantially C-shaped body and includes distally extending spring mounting tabs 128, a distally extending link tab 130, a side wall recess 132 (FIG. 9), and an opposite side wall extension 134.

In embodiments, the springs 122 are coil springs that have a proximal portion that is received about the spring mounting tabs 128 of the slide member half-section 120. Each of the springs 122 is positioned within a respective pocket 116, 118 (FIG. 9) defined in the housing 22 to urge the slide member half-section 120 distally along the housing 22. The link tab 130 is positioned within the recess 79 and is received within the notch 78 to engage the articulation link 30 to urge the articulation link 30 to a position in which the tool assembly 14 is in the non-articulated position. When the articulation link 30 is positioned such that the tool assembly 14 is in the non-articulated position, the springs 122 are in an unbiased state with the link tab 130 engaged with the notch 78 of the articulation link 30.

In embodiments, the slide member half-sections 90 and 120 are connected together within the recess 94 about the housing 22. In embodiments, the side wall extensions 114 of the slide member half-section 90 are received within the side wall recesses 132 of the slide member half-section 120 and the side wall extensions 144 of the slide member half-section 120 are received within the side wall recesses 112 of the slide member half-section 90 to couple the slide member half-sections 90 and 120 together. Alternately, it is envisioned that the slide member half-sections 90, 120 can be coupled together using a variety of coupling techniques.

Referring to FIGS. 10-12, in the non-articulated position of the tool assembly 14, the springs 92 and 122 (FIG. 12) of the first and second biasing mechanisms 82, 84, respectively are substantially in an unbiased state and the link tabs 111 and 130 of the first biasing mechanism 82 and the second biasing mechanism 84 are received within the notches 72 and 78 of the articulation links 28 and 30.

Referring to FIGS. 13-16, when the reload 10 is secured to the adapter 112 or the elongate body 212 of the stapling device 100, 200 (FIGS. 1 and 2) and the handle assembly 110, 210 is operated to articulate the tool assembly 14, the articulation link 28 which is connected to the articulation system of the stapling device 100, 200 is moved axially within the proximal body portion 12 of the reload 10, for example, in the direction indicated by arrows “A” in FIGS. 14 and 15. It is noted that the articulation link 28 is a driven or active link that is driven by a mechanism in the body 212 of the stapling device 100, 200, whereas the articulation link 30 is a non-driven or passive articulation link that responds to movement of the active articulation link 28 through movement of the tool assembly 14. When the articulation link 28 moves axially in the direction indicated by arrow “A” in FIG. 14, the tool assembly 14 articulates in the direction indicated by arrows “B” in FIGS. 13 and 14 about the pivot axis “X” and the stabilization mechanism 34 is urged in the direction “C” as indicated in FIG. 14 via engagement between the the link tab 111 of the slide member half-section 90 and the articulation link 28. In addition, as the tool assembly 14 articulates about the pivot axis “X”, the articulation link 30 moves proximally in the direction indicated by arrow “D” in FIG. 16 such that the link tab 130 of slide member half-section 120 (FIG. 16) moves to a position spaced from the notch 78 of the articulation link 30 out of engagement with the articulation link 30.

Referring to FIGS. 17 and 18, when the articulation link 28 is moved axially in the other direction indicated by arrow “E” in FIG. 17, the springs 92 will urge the stabilization mechanism 34 back towards a position in which the tool assembly 14 is in the non-articulated position. When the tool assembly 14 reaches the non-articulated position, the springs 92 will be in a non-compressed position. Continued movement of the articulation link 28 by the stapling device 100, 200 in the direction indicated by arrow “E” will cause the articulation link 30 to move in an opposite direction indicated by arrow “F” such that the link tab 130 of the slide member half-section 120 will be received in the notch 78 on the articulation link 30 of the stabilization mechanism 34 and engage the articulation link 30 to move the stabilization mechanism 34 in the direction indicated by arrow “F”. This movement compresses the springs 92, 122 such that the articulation link 30 is urged towards a position in which the tool assembly 14 is non-articulated.

When a small force is applied to the tool assembly 14 during periods of non-use such as during shipping of storage, the springs 92 and 122 of the stabilization mechanism urge the tool assembly 14 of the stapling device 100, 200 to counter act these small forces and maintain the tool assembly in the non-articulated position.

Persons skilled in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments. It is envisioned that the elements and features illustrated or described in connection with one exemplary embodiment may be combined with the elements and features of another without departing from the scope of the present disclosure. As well, one skilled in the art will appreciate further features and advantages of the disclosure based on the above-described embodiments. Accordingly, the disclosure is not to be limited by what has been particularly shown and described, except as indicated by the appended claims. 

What is claimed is:
 1. A reload comprising: a proximal body portion defining a longitudinal axis and including a housing, a drive member movably supported within the housing between a retracted position and an advanced position, a first articulation link and, a second articulation link; a tool assembly defining a longitudinal axis and being pivotably supported on a distal end of the proximal body portion, the tool assembly including a first jaw and a second jaw, the first jaw being pivotable in relation to the second jaw between a spaced position and a clamped position; a mounting assembly secured to a proximal portion of the tool assembly, the mounting assembly including a pivot member defining a pivot axis, the first articulation link being connected to the mounting assembly on one side of the pivot axis and the second articulation link being connected to the mounting assembly on an opposite side of the pivot axis; wherein the first and second articulation links are axially movable within the housing to pivot the tool assembly about the pivot axis from a non-articulated position to a plurality of articulated positions; a stabilization system including a slide member slidably positioned on the housing of the proximal body portion and a biasing member, the slide member being engaged with the first and second articulation links, and the biasing member being positioned to urge the slide member in a direction to urge the tool assembly towards the non-articulated position.
 2. The reload of claim 1, wherein the slide member includes first and second halves that are slidably positioned about the housing of the proximal body portion.
 3. The reload of claim 2, wherein the housing of the proximal body portion of the reload defines an annular recess, the slide member being slidably positioned within the annular recess.
 4. The reload of claim 1, wherein the biasing member includes at least one coil spring.
 5. The reload of claim 4, wherein the slide member includes at least one mounting tab, each of the at least one coil springs having a first end positioned about a respective one of the at least one mounting tabs.
 6. The reload of claim 5, wherein the slide member includes first and second halves, each of the first and second halves of the slide member having two mounting tabs, each of the mounting tabs being engaged with one of the plurality of coil springs.
 7. The reload of claim 5, wherein the housing of the proximal body portion of the reload defines at least one pocket, each of the at least one coil spring being received within one of the at least one pocket.
 8. The reload of claim 1, wherein the slide member includes first and second link tabs, each of the first and second link tabs being engaged with one of the first and second articulation links.
 9. The reload of claim 8, wherein each of the first and second articulation links defines a notch, each of the link tabs being engaged with one notch of a respective one of the first and second articulation links.
 10. The reload of claim 1, wherein the first articulation link includes a proximal end configured to engage an articulation mechanism of a surgical stapling device.
 11. A surgical stapling device comprising: a handle assembly; an elongated body portion, the elongated body portion defining a longitudinal axis and including a housing, a drive member movably supported within the housing between a retracted position and an advanced position, a first articulation link and, a second articulation link; a tool assembly defining a longitudinal axis and being pivotably supported on a distal end of the elongated body portion, the tool assembly including a first jaw and a second jaw, the first jaw being pivotable in relation to the second jaw between a spaced position and a clamped position; a mounting assembly secured to a proximal portion of the tool assembly, the mounting assembly including a pivot member defining a pivot axis, the first articulation link being connected to the mounting assembly on one side of the pivot axis and the second articulation link being connected to the mounting assembly on an opposite side of the pivot axis; and a stabilization system including a slide member slidably positioned on the housing of the proximal body portion and a biasing member, the slide member being engaged with the first and second articulation links, and the biasing member being positioned to urge the slide member in a direction to urge the tool assembly towards the non-articulated position.
 12. The surgical stapling device of claim 11, wherein the tool assembly is supported on a reload that is releasably coupled to a distal portion of the elongated body portion, a proximal body portion of the reload defining a distal portion of the elongated body portion.
 13. The surgical stapling device of claim 11, wherein the slide member includes first and second halves that are slidably positioned about the housing of the elongated body portion.
 14. The surgical stapling device of claim 11, wherein the housing of the elongated body portion defines an annular recess, the slide member being slidably positioned within the annular recess.
 15. The surgical stapling device of claim 11, wherein the biasing member includes at least one coil spring.
 16. The surgical stapling device of claim 15, wherein the slide member includes at least one mounting tab, each at least one coil spring having a first end positioned about a respective one of the at least one mounting tabs.
 17. The surgical stapling device of claim 16, wherein the slide member includes first and second halves, each of the first and second halves of the slide member having two mounting tabs, each of the mounting tabs being engaged with one of the plurality of coil springs.
 18. The surgical stapling device of claim 17, wherein the housing of the elongated body portion defines at least one pocket, each of the at least one coil spring being received within one of the at least one pocket.
 19. The surgical stapling device of claim 11, wherein the slide member includes first and second link tabs, each of the link tabs being engaged with one of the first and second articulation links.
 20. The surgical stapling device of claim 8, wherein each of the first and second articulation links defines a notch, each of the link tabs being engaged with one notch of a respective one of the first and second articulation links. 